Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online). Mark Zegarelli
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СКАЧАТЬ by switching around the two numbers next to the equal sign: math. So, math.

      (e) 81. Rewrite math using the commutative property: math. Now rewrite this equation as its inverse: math. So, math.

      (f) 20. Rewrite math by switching around the two numbers next to the equals sign: math. So, math.

      5 58. First, do the multiplication inside the parentheses:

math

      Now add: math.

      6 123. First, do the subtraction inside the parentheses:

math

      7

      (a) math

      (d) math

      Yes, the placement of parentheses changes the result.

      8

      (a) math

      (b) math

      No, because of the associative property of addition, the placement of parentheses doesn’t change the result.

      9

      (a) math

      (b) math

      No, because of the associative property of multiplication, the placement of parentheses doesn’t change the result.

      10 937,690. The problem is easiest to solve by placing parentheses around math:

math

      11 math

      12 math

      13 math

      14 math

      15

      (a) math

      (b) math

      (c) math

      (d) math

      16

      (a) math

      (b) math

      (c) math

      (d) math

      17 math

      19

      (a) math

      (b) math

      (c) math

      (d) math. You already know from part c that math, so multiply this number by 2 to get your answer: math.

      20

      (a) 10,000. Write 1 followed by four 0s.

      (b) 10,000,000,000. Write 1 followed by ten 0s.

      (c) 1,000,000,000,000,000. Write 1 followed by fifteen 0s.

      (d) 10. Any number raised to the power of 1 is that number.

      In the next section, the chapter quiz gives you a chance to practice the skills you learned in this chapter.